Unicode subscripts and superscripts

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The difference between superscript/subscript and numerator/denominator glyphs. In many popular fonts the Unicode "superscript" and "subscript" characters are actually numerator and denominator glyphs. Sub super num dem.svg
The difference between superscript/subscript and numerator/denominator glyphs. In many popular fonts the Unicode "superscript" and "subscript" characters are actually numerator and denominator glyphs.

Unicode has subscripted and superscripted versions of a number of characters including a full set of Arabic numerals. [1] These characters allow any polynomial, chemical and certain other equations to be represented in plain text without using any form of markup like HTML or TeX.

Contents

The World Wide Web Consortium and the Unicode Consortium have made recommendations on the choice between using markup and using superscript and subscript characters:

When used in mathematical context (MathML) it is recommended to consistently use style markup for superscripts and subscripts […] However, when super and sub-scripts are to reflect semantic distinctions, it is easier to work with these meanings encoded in text rather than markup, for example, in phonetic or phonemic transcription. [2]

Uses

The intended use [2] when these characters were added to Unicode was to produce true superscripts and subscripts so that chemical and algebraic formulas could be written without markup. Thus "H₂O" (using a subscript 2 character) is supposed to be identical to "H2O" (with subscript markup).

In reality, many fonts that include these characters ignore the Unicode definition, and instead design the digits for mathematical numerator and denominator glyphs, [3] [4] which are aligned with the cap line and the baseline, respectively. When used with the solidus, these glyphs are a common substitute for diagonal fractions, such as ³/₄ for the ¾ glyph. This change was made because using markup does not give a good graphic approximation of fractions (compare markup 3/4 with super/sub-script ³/₄). The change also makes the superscript letters useful for ordinal indicators, more closely matching the ª and º characters. However, it makes them incorrect for normal superscript and subscript, and so chemical and algebraic formulas are better rendered by using markup.

Unicode intended that diagonal fractions be rendered by a different mechanism: the fraction slash U+2044 is visually similar to the solidus, but when used with the ordinary digits (not the superscripts and subscripts), it instructs the layout system that a fraction such as ¾ is to be rendered using automatic glyph substitution. [5] [lower-alpha 1] User-end support was quite poor for a number of years, but browsers [lower-alpha 2] and fonts increasingly support the intended Unicode behavior. A selection of supporting fonts is displayed in the table below. (These will not display properly if you do not have the fonts installed, or if your browser does not support this behavior.)

Comparison of encodings of simple fractions
FontU+00BDVULGAR FRACTION ONE HALFU+0031DIGIT ONEU+2044FRACTION SLASHU+0032DIGIT TWO
Browser default font½1⁄2
Andika ½1⁄2
Arno Pro ½1⁄2
URW Bookman ½1⁄2
Brill ½1⁄2
Brioso Pro ½1⁄2
Calibri ½1⁄2
Candara ½1⁄2
Carlito ½1⁄2
Cantarell ½1⁄2
FiraGO ½1⁄2
EB Garamond ½1⁄2
Gentium Book ½1⁄2
URW Gothic ½1⁄2
Lato ½1⁄2
Linux Libertine ½1⁄2
Nimbus Roman ½1⁄2
Nimbus Sans ½1⁄2
Noto Sans ½1⁄2
Noto Serif ½1⁄2
Open Sans ½1⁄2
Ubuntu ½1⁄2
Yrsa ½1⁄2

Superscripts and subscripts block

The most common superscript digits (1, 2, and 3) were in ISO-8859-1 and were therefore carried over into those positions in the Latin-1 range of Unicode. The rest were placed in a dedicated section of Unicode at U+2070 to U+209F. The two tables below show these characters. Each superscript or subscript character is preceded by a normal x to show the subscripting/superscripting. The table on the left contains the actual Unicode characters; the one on the right contains the equivalents using HTML markup for the subscript or superscript.

Unicode characters
0123456789ABCDEF
U+00Bx
U+207x x⁰xⁱx⁴x⁵x⁶x⁷x⁸x⁹x⁺x⁻x⁼x⁽x⁾xⁿ
U+208x x₀x₁x₂x₃x₄x₅x₆x₇x₈x₉x₊x₋x₌x₍x₎
U+209x xₐxₑxₒxₓxₔ xₕxₖxₗxₘ xₙxₚxₛxₜ
Simulated using <sup> or <sub> tags
0123456789ABCDEF
U+00Bx x2x3x1
U+207x x0xix4x5x6x7x8x9x+xx=x(x)xn
U+208x x0x1x2x3x4x5x6x7x8x9x+xx=x(x)
U+209x xaxexoxxxəxhxkxlxmxnxpxsxt
  Reserved for future use.
  Other characters from Latin-1 not related to super- or sub-scripts.

Other superscript and subscript characters

Unicode version 15.1 also includes subscript and superscript characters that are intended for semantic usage, in the following blocks: [1] [6]

Superscript
Combining superscript
Subscript
Combining subscript

Latin, Greek, Cyrillic, and IPA tables

Consolidated, the Unicode standard contains superscript and subscript versions of a subset of Latin, Greek and Cyrillic letters. Here they are arranged in alphabetical order for comparison (or for copy and paste convenience). Since these characters appear in different Unicode ranges, they may not appear to be the same size or position due to font substitution in the browser. Shaded cells mark small capitals that are not very distinct from minuscules, and Greek letters that are indistinguishable from Latin, and so would not be expected to be supported by Unicode.

Little punctuation is encoded. Parentheses and the exclamation mark are shown above. A question mark may be created with a superscript gelded question mark and a combining dot: ˀ̣, although some computers do not render it properly.

Latin superscript and subscript letters
ABCDEFGHIJKLMNOPQRSTUVWXYZ
Superscript capitalᴿ
Superscript small cap𐞄𐞒𐞖𐞪𐞲
Superscript minusculeʰʲˡ𐞥ʳˢʷˣʸ
Overscript capital◌ᷛ◌ᷞ◌ᷟ◌ᷡ◌ᷢ
Overscript minuscule◌ͣ◌ᷨ◌ͨ◌ͩ◌ͤ◌ᷫ◌ᷚ◌ͪ◌ͥ◌ᷜ◌ᷝ◌ͫ◌ᷠ◌ͦ◌ᷮ◌ͬ◌ᷤ◌ͭ◌ͧ◌ͮ◌ᷱ◌ͯ◌ᷦ
Subscript minuscule
Underscript minuscule◌᷊◌ᪿ
Greek superscript and subscript letters
ΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡΣΤΥΦΧΨΩ
Superscript minuscule [upper-alpha 1] ᶿ [upper-alpha 1]
Overscript minuscule◌ᷩ
Subscript minuscule
  1. 1 2 In some fonts, Latin alpha ᵅ and upsilon ᶹ can be used as superscript Greek alpha and upsilon. ᵋ and ᶥ are also officially Latin letters, but display the same as Greek.
Cyrillic superscript and subscript letters
А Ә Б В Г Ґ Д Е Є Ж З Ѕ И І Ї Ј К Л М Н О Ө П Р С Ҫ
Superscript𞀰𞁋𞀱𞀲𞀳𞀴𞀵𞀶𞀷𞁊𞀸𞁌𞁍𞀹𞀺𞀻𞀼𞁎𞀽𞀾𞀿𞁫
Overscript◌ⷶ◌ⷠ◌ⷡ◌ⷢ◌ⷣ◌ⷷ◌ꙴ◌ⷤ◌ⷥ◌ꙵ𞂏◌ꙶ◌ⷦ◌ⷧ◌ⷨ◌ⷩ◌ⷪ◌ⷫ◌ⷬ◌ⷭ
Subscript𞁑𞁒𞁓𞁔𞁧𞁕𞁖𞁗𞁘𞁩𞁙𞁨𞁚𞁛𞁜𞁝𞁞
Т У Ү Ұ Ф Х Ѡ Ц Ч Џ Ш Щ Ъ Ы Ь Ѣ Э Ю Ѥ Ѧ Ѫ Ѭ Ѳ Ӏ
Superscript𞁀𞁁𞁏𞁭𞁂𞁃𞁄𞁅𞁆𞁬𞁇𞁈𞁉𞁐
Overscript◌ⷮ◌ꙷ◌ⷹ◌ꚞ◌ⷯ◌ꙻ◌ⷰ◌ⷱ◌ⷲ◌ⷳ◌ꙸ◌ꙹ◌ꙺ◌ⷺ◌ⷻ◌ⷼ◌ꚟ◌ⷽ◌ⷾ◌ⷿ◌ⷴ
Subscript𞁟𞁠𞁡𞁢𞁣𞁪𞁤𞁥𞁦

Many of the Cyrillic characters were added to the Cyrillic Extended-D block, which was added to the free Gentium Plus and Andika fonts with version 6.2 in February 2023.

See also small caps in Unicode.

Superscript IPA

The Latin Extended-F block was created for the remaining superscript IPA letters. They were added to the free Gentium Plus and Andika fonts with version 6.2 in February 2023.

The Unicode characters for superscript (modifier) IPA and extIPA consonant letters are as follows. Characters for sounds with secondary articulation are set off in parentheses and placed below the base letters:

IPA and extIPA consonants, along with superscript variants and their Unicode code points
Bi­labialLabio­dentalDentalAlveolarPost­alveolarRetro­flexPalatalVelarUvularPharyn­gealGlottal
Nasalm 
1D50
ɱ 
1DAC
n 
207F
ɳ 
1DAF
ɲ 
1DAE
ŋ 
1D51
ɴ 
1DB0
Plosivep 
1D56
b 
1D47
t 
1D57
d 
1D48
ʈ 𐞯
107AF
ɖ 𐞋
1078B
c 
1D9C
ɟ 
1DA1
k 
1D4F
ɡ /g 
1DA2/1D4D
q 𐞥
107A5
ɢ 𐞒
10792
ʡ 𐞳
107B3
ʔ ˀ
02C0
Affricateʦ 𐞬
107AC
ʣ 𐞇
10787
ʧ 𐞮
107AE
(ʨ𐞫)
107AB
ʤ 𐞊
1078A
(ʥ𐞉)
10789
 𐞭
107AD
 𐞈
10788
Fricativeɸ 
1DB2
β 
1D5D
f 
1DA0
v 
1D5B
θ ᶿ
1DBF
ð 
1D9E
s ˢ
02E2
z 
1DBB
ʃ 
1DB4
(ɕ)
1D9D
ʒ 
1DBE
(ʑ)
1DBD
ʂ 
1DB3
ʐ 
1DBC
ç ᶜ̧
1D9C + 0327 [lower-alpha 3]
ʝ 
1DA8
x ˣ
02E3
(ɧ 𐞗)
10797
ɣ ˠ
02E0
χ 
1D61
ʁ ʶ
02B6
ħ 𐞕
10795
(ʩ 𐞐)
10790
ʕ ˤ
02E4 [lower-alpha 4]
h ʰ
02B0
ɦ ʱ
02B1
Approximantʋ 
1DB9
ɹ ʴ
02B4
ɻ ʵ
02B5
j ʲ
02B2
(ɥ )
1DA3
 
 
(ʍ )
AB69
ɰ 
1DAD
(w ʷ)
02B7
Tap/flap 𐞰
107B0
ɾ 𐞩
107A9
ɽ 𐞨
107A8
Trillʙ 𐞄
10784
r ʳ
02B3
ʀ 𐞪
107AA
ʜ 𐞖
10796
ʢ 𐞴
107B4
Lateral fricativeɬ 𐞛
1079B
(ʪ 𐞙)
10799
ɮ 𐞞
1079E
(ʫ 𐞚)
1079A
 𐞝
1079D
𝼅 𐞟
1079F
𝼆 𐞡
107A1
𝼄 𐞜
1079C
Lateral approximantl ˡ
02E1
 ꭞ)
AB5E [lower-alpha 5]
ɭ 
1DA9
ʎ 𐞠
107A0
ʟ 
1DAB
Lateral tap/flapɺ 𐞦
107A6
𝼈 𐞧
107A7
Implosiveɓ 𐞅
10785
ɗ 𐞌
1078C
 𐞍
1078D
ʄ 𐞘
10798
ɠ 𐞓
10793
ʛ 𐞔
10794
Click releaseʘ 𐞵
107B5
ǀ 𐞶
107B6
ǃ 
A71D
𝼊 𐞹
107B9
ǂ 𐞸
107B8
Lateral click
release
ǁ 𐞷
107B7
Percussive¡ 
A71E [lower-alpha 6]

The spacing diacritic for ejective consonants, U+2BC, works with superscript letters despite not being superscript itself: ᵖʼ ᵗʼ ᶜʼ ᵏˣʼ. If a distinction needs to be made, the combining apostrophe U+315 may be used: ̕̕̕ ᵏˣ̕. The spacing diacritic should be used for a baseline letter with a superscript release, such as [tˢʼ] or [kˣʼ], where the scope of the apostrophe includes the non-superscript letter, but the combining apostrophe U+315 might be used to indicate a weakly articulated ejective consonant like [ᵗ̕] or [ᵏ̕], where the whole consonant is written as a superscript, or together with U+2BC when separate apostrophes have scope over the base and modifier letters, as in pʼᵏˣ̕. [8]

Spacing diacritics, as in , cannot be secondarily superscripted in plain text: ᵗʲ. (In this instance, the old IPA letter for [tʲ], ƫ, has a superscript variant in Unicode, U+1DB5 , as does the lateral, U+1DDA , but that is not generally the case.)

Among older letters, (U+A727), a graphic variant of ɮ, is supported at (U+AB5C).

The Unicode characters for superscript (modifier) IPA vowel letters, plus an extended letter found in English dictionaries, are as follows. Most recently retired alternative letters are also supported; they are set off in parentheses and placed below the standard IPA letters:

IPA vowels and superscript variants
FrontCentralBack
Closei 
2071
y ʸ
02B8
ɨ 
1DA4
ʉ 
1DB6
ɯ 
1D5A
u 
1D58
Near-closeɪ 
1DA6
(ɩ )
1DA5
ʏ 𐞲
107B2


 
1DA7


ʊ 
1DB7
(ɷ 𐞤)
107A4
Close-mide 
1D49
ø 𐞢
107A2
ɘ 𐞎
1078E
ɵ 
1DB1
ɤ 𐞑
10791
o 
1D52
Midə 
1D4A
Open-midɛ 
1D4B
œ 
A7F9
ɜ 
1D9F
( )
1D4C
ɞ 𐞏
1078F
ʌ 
1DBA
ɔ 
1D53
Near-openæ 𐞃
10783
ɶ 𐞣
107A3
ɐ 
1D44
ɑ 
1D45
ɒ 
1D9B
Opena 
1D43

The precomposed Unicode rhotic vowel letters ɚ ɝ are not directly supported. The rhotic diacritic U+02DE ◌˞ should be used instead: ᵊ˞ ᶟ˞. [9]

ɜ and are reversed ɛ. The older IPA turned ɛ, , is also supported, at U+1D4C . However, the briefly resurrected vowel letter ʚ (U+029A) is not supported, only its reversed replacement ɞ is.

Among older vowels, (U+1D1C), a graphic variant of ʊ, is supported at (U+1DB8).

The two length marks are also supported:

Length marks
LongHalf-long
ː 𐞁
10781
ˑ 𐞂
10782

Superscript wildcards (full caps) are partially supported: e.g. ᴺC (prenasalized consonant), ꟲN (prestopped nasal), Pꟳ (fricative release), NᴾF (epenthetic plosive), CVNᵀ (tone-bearing syllable), Cᴸ (liquid or lateral release), Cᴿ (rhotic or resonant release), Vᴳ (off-glide/diphthong), Cⱽ (fleeting vowel). Superscript S for sibilant release has preliminary approval for Unicode 17; superscript for fleeting/epenthetic click does not. Other basic Latin superscript wildcards for tone and weak indeterminate sounds, as described in the article on the International Phonetic Alphabet, are mostly supported. (See table in previous section.)

In addition, a very few IPA letters beyond the basic Latin alphabet have combining forms or are supported as subscripts:

Additional IPA characters
ɑæçðəʃʍʔʼ
Overscript◌ᷧ◌ᷔ◌ᷗ◌ᷙ◌ᷪ◌ᷯ◌̉ [lower-alpha 7] ◌̓
Subscript
Underscript◌ᫀ◌̦

Composite characters

Primarily for compatibility with earlier character sets, Unicode contains a number of characters that compose super- and subscripts with other symbols. [1] In most fonts these render much better than attempts to construct these symbols from the above characters or by using markup.

Notes

  1. For a general overview and technical information on glyph substitution (though not specifically for fractions): GSUB — Glyph Substitution Table in the OpenType specification on the Microsoft Typography site.
  2. Such as Chrome, Firefox and Falkon
  3. Superscript ç is composed of superscript c and a combining cedilla, which should display properly in a good font. Superscript c was specifically requested for this purpose in Unicode proposal L2/03-180.
  4. U+02E4ˤMODIFIER LETTER SMALL REVERSED GLOTTAL STOP is the superscript variant of U+0295ʕLATIN LETTER PHARYNGEAL VOICED FRICATIVE and is defined for IPA use. The similar character U+02C1ˁMODIFIER LETTER REVERSED GLOTTAL STOP is a reversed U+02C0ˀMODIFIER LETTER GLOTTAL STOP, perhaps a gelded reversed question mark. Fonts are inconsistent in whether they look different and what the difference is.
  5. In Microsoft fonts this character was erroneously designed as a superscript .
  6. U+A71D and A71E were adopted as the Africanist equivalents of the IPA characters downstep and upstep. The correspondence of U+A71D to the IPA click letter ǃ is thus accidental. Coincidentally, U+A71E serves as the superscript variant of the extIPA percussive consonant ¡; the other percussive letters, ʬ and ʭ, do not have superscript support in Unicode.
  7. This is actually the Vietnamese diacritic dấu hỏi , not specifically IPA, but graphically both are gelded question marks.

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References

  1. 1 2 3 "UCD: UnicodeData.txt". The Unicode Standard. Retrieved 2016-05-14.
  2. 1 2 Martin Dürst, Asmus Freytag (16 May 2007). "Unicode in XML and other Markup Languages". W3C. Retrieved 13 September 2010.
  3. "fraction | Dart Package". Dart packages. 27 December 2021. Retrieved 21 September 2022.
  4. "MathML | General layout elements | Fractions". data2type GmbH (in German). 30 March 2021. Retrieved 13 January 2022.[ dead link ]
  5. Martin Dürst, Asmus Freytag (16 May 2007). "Fraction Slash". W3C. Retrieved 13 September 2010.
  6. "UCD: Scripts.txt". The Unicode Standard. Retrieved 2022-09-21.
  7. Everson, Michael; West, Andrew (2020-10-05). "L2/20-268: Revised proposal to add ten characters for Middle English to the UCS" (PDF).
  8. Kirk Miller & Michael Ashby, L2/20-253R Unicode request for IPA modifier letters (b), non-pulmonic.
  9. Kirk Miller & Michael Ashby, L2/20-252R Unicode request for IPA modifier-letters (a), pulmonic
  10. Silva, Eduardo Marín (2017-03-01). "L2/17-066R: Proposal to encode the Marca Registrada sign" (PDF).